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Патент USA US2101209

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Dec. 7, 1937.
vw. M. BACON
Filed July 21, 1954
m“52g.3 Q25Dx3N.
Patented Dec. 7, 1937
‘ 2,101,209
Walter Meredith Bacon, New York, N. Y., assign
or to American Telephone and Telegraph Com
pany, a corporation of New York
Application July 2-1, 1934, Serial No. 736,406
2 Claims. (01. 175-320)
This invention relates to signaling and to
alarm systems, and more particularly to munici
pal emergency alarm systems.
It is an object of this invention to provide an
alarm system whereby the general public may
get into communication with a central station or
alarm opens the door of the alarm box, which ‘
headquarters for the purpose 01' reporting ?res,
instantaneously lights a red lamp associated with
that particular box at the headquarters. On
opening the door of the box a telephone set is
available and may be used to report the details
of the alarm to the operator at the headquarters
board who, on reception of the lamp signal, has
answered it by inserting the plug of her cord
circuit in the jack connected to that particular
box. In this way even it the person wishing to
accidents or police alarms. In accordance with
one feature of this invention means are provided
0 whereby police or other o?lcials may also get in
touch with the central station or headquarters
to give general reports or special alarms. In ac
cordance with another feature means are'also
provided whereby the police signals can be dis
tinguished instantly from the signals sent in b
. the general public.
The invention will be more fully understood
from the following description when considered
in connection with the accompanying drawing in
20 which one form of the invention is diagrammati
cally illustrated in Figure 1 and Fig. 2 diagram
matically shows apparatus for holding a relay,
similar to certain types of relay of this inven
tion, continuously operated by interrupted cur
25 rent.
so that opengrounded or short-circuit condi
tions are‘ instantly indicated at the headquarters.
The system ‘involved in this invention is so
designed that if the public sends an alarm the
following takes place: The person sending the
As shown in the drawing, the invention con-'
sists fundamentally of alarm boxes distributed
transmit an alarm is unable to use the telephone
in the box, due to excitement or other causes, '
the operator will instantly know from which box
the alarm is being transmitted and help can be
dispatched immediately. At the same time as
the person transmitting the alarm opens the
door, a loud local alarm mounted near the box
rings to attract attention to the box, so that
police or other omcials in the neighborhood may
act at once, and thus false alarms will be dis 25
When a patrolman or other o?icial desires to
throughout a municipality and a central alarm
headquarters where signals are received.
communicate with alarm headquarters irom one '
Each ‘ of these street boxes,_he ?rst inserts a key ‘in
30 alarm box consists of a ruggedly constructed - the door or side 'of the box and then opens the 30'
housing containing a telephone set, ringing equip
box door. The opening of the door after the
ment and the apparatus required to send in the insertion of the special key brings up the green
alarm. At each box a local gong is provided light associated with that particular box at the
which rings and attracts attention to the box headquarters. He then proceeds by telephone to
give the desired message or information to the
where the gong is operated an _ an alarm is
being sent by the general public. A method of
operator.‘ The insertion of the key in the box
attracting attention to this box by means of a
lamp or loud gong under the control of the cen—
disconnects the loud local gong so that it does
tral headquarters operator is also provided. The
mission of an official message.
40 headquarters station consists of a telephone
switchboard in which conductors from each of
the alarm boxes terminate as well as special
trunks from the central offices of the local tele
phone company ‘and other places from which
special calls may be received. Each line termi
nation appears on the headquarters switchboard
_ as a jack, and associated with each jack are three I
signal lamps.
One of these lamps provides a
green light to indicate the police-signal, another
50 lamp provides a red light to indicate a ?re or
public alarm signal, and a third lamp a white
light which indicates a trouble condition on the
In systems of the above character continuous -
55 supervision oi’ the line circuit may be provided
not ring when the door is opened for the trans
If the headquarters operator desires to call a
patrolman known to be near a certain box, she
may do so at; any time by ringing over the cir
cult which operates either a signal gong or sig
nal lamp at the box location.
The circuit used in this system is a normally
closed circuit supplied with alternating current, -
as, for example, low-voltage 60-cycle A. C. power.
This power is connected to the line conductors
at all times except when the circuit‘is actually
transmitting an alarm.
In the drawing there is‘shown a substation A»
which is connected to the central o?lce or head
quarters B by means of a line L. Normally with
the alarm box door at the substation A closed,
the circuit is as follows: From alternating current 55
power source 5, overleft terminal of a power
the general alarm gong ii to sound. This circuit .
transformer, left inner normal contact of relay
‘extends from minus power terminal 36, left con-I
tact of relay id, lamp‘ it, right contact of relay 9,
6 at headquarters station B, over one side of the
line L through the closed switchhook contact 36
of the telephone set T at station A, through the
gong ill to plus power terminal 37. The person
transmitting the alarm, upon removing the tele- 5
normally closed contact 7, through resistance 3 .phone set from the switchhook at the box, con
and associated condenser to the other side of the . nects the telephone equipment to the line through
line L, back to the headquarters station B, the upper contacts of the switchhook and removes
through the outer left normally closed contacts of all the other box equipment from the line by open
10 relay 6, middle make contact of relay 9, normally ing the circuit at switchhook contacts 313. At the 10
closed middle contact of relay l t, contact of mar
same time that the door of the alarm box at sta
ginal relay H, where the circuit ‘splits, half of tion A is opened, a circuit is established from
the alternating current going through the-right power source 29, contact 30, conductors 3i, con
winding of relay H and copper oxide recti?er tact 32, and the local gong it back to power
iii in one direction and the other half through
the left .winding of relay ii and copper oxide
recti?er it in the other direction, through the
source 2%. The closing of this circuit causes the
local gong it at station A to sound;
When a patrolman'uses the box at station A
windings of relays 9 and it, respectively, and
he ?rst inserts a key, which breaks contacts 95
and 38 and makes contact 33. He then opens the
box door, which breaks contact 7 and makes con 20
tact 38 and connects recti?er is through make
back to the source of power 5 through the right
20 hand contact of the power transformer. In this
way relays 9 and it are normally operated and
relay H, which is a marginal relay, is normally
contact .33 and switchhookv contact 3% across
released due to the limitation of the currrent in the line. This permits the current to flow over
the circuit by the resistance of the line and the ’ line conductors l in only one direction, which is
25 resistance 8 at the substation A.
opposite to that in which it ?owed over said con-r 25
When a public alarm isvtransmitted‘ from the
alarm box at station A, the opening of the alarm
box door breaks contact ‘i’ which removes the
resistance 8 and associated condensers normally
,30 bridged across the line conductors L and sub
stitutes in their places copper oxide recti?er i6
and associated resistance which is connected to
the line through contact it. The circuit then
established includes the left-hand normal inner
35 contact of relay 5, one side of line L, closed
' switchhook contact 313, contact 38, resistance as
sociated with recti?er l6, recti?er iii, contact i5,
the other side of line L,,left-hand normal outer _
contact of relay 8, contact 56 of relay 9, contact 62
40 of relay lll,'contact of relay l i', left-hand wind
ing of relay ii, recti?er l3, winding of relay 9,
back to the secondary winding of the power trans
_ former. The recti?er~ld~permits only half of the
alternating current ‘to now through the circuit
45 over line conductors’LI so that the current now
1 flowing is interrupted, direct current ?owing in
one direction only‘; It will be apparent that this
unidirectional current ?owing over the line con
ductors through the windings of relay it meets
60 the recti?ers 13 and i2, one of which opposes its
?ow,an_d the other of which permits it to pass. In
this'instance, the current is permitted to flow
through recti?er is through winding of relay 9,
‘ thereby holding this relay operated.
It cannot
55 ?ow through recti?er l2, which is poled opposite
to recti?er I3 and relay iii, therefore, releases.
When relay it releases, it looks itself unoperated
by the closing of the circuit at contact 5d of the
relay ill.
This locking circuit just referred to
80 extends from the left-hand contact of the wind
ing'of relay at, contact 58 of the relay w, the
ductors for a public alarm as just described.
In .
this instance the current passesirom the right
hand contact, of the secondary of transformer 5,
normally closed inner left-hand contact of relay
6, line L, switchhook contact 36, contact 38, recti 30
?er i9 and associated resistancecontact 33, line
L, outermost left-hand contact of relay E, contact
{ill of relay 9, contact 62 of relay iii, contact of
relay ill, right-hand winding relay ll, recti?er i2,
winding of relay M3, back to the right-hand con; 35
tact of the secondary of transformer 5. This holds
relay iii operated but releases relay @ as no current
passes through recti?er is which is poled opposite
to recti?er i§.f The locking path of relay it
extends from the right-hand contact of the sec—. 40
ondary of transformer 5, winding of relay 6B,.
recti?er i2, right-hand winding of relay ii; con
tact of relay ii, contact £32 of relay iii, contact '
£35 of relayii, resistance 22 to the left-hand con
tact. of transformer secondary 5. The contacts 415
of relay 9 look it in the unoperated‘ position
through the closure of its contact 413 which is in
cluded in alcircuit with the second contact at
the right of relay
By virtue of the opening of
contact 663 of relay 9, relay apparatus at the cen 50
tral stations B is removed from the line 'L nor
mally connected through this contact. Relay 9
through its contacts also lights the police lamp
2t and operates the o?ce alarm gong Hi. This
circuit extends from-minus terminal 36 through 65
the normally closed contact of relay iii, lamp-2i),
off normal contact of relay ii, gong ii to posi
tive terminal 31?. When the patrolman removes
the telephone set at station A, the switchhook
contacts connect the set to the line conductors 60
‘L and remove the rest of the box equipment from
the line at switchhook contact 3%. The breaking
of contact at at station A by the insertion of the
right-hand innermost contact of relay 6 and back
to the right-hand contact of the winding of relay
i0. During this condition the headquarters relay patrolman’s key opens the circuit of the local
65 equipment is removed from the line L at contact gong it, which in this case does not sound when
:32 of relay in and at the same time, relay 9 is the ‘door is opened. locked in operated position through contact 85
In answering either the police signal lamp 20
of relay lli.- Relay 9 is locked operated through .or the public signal lamp l6, the headquarters
the following circuit. Right-hand side of sec.
operator inserts plug 2%’ into Jack 28, thereby
70 ondary of transformer 5, winding of relay 9, rec-_ operating relay 6 over a circuit from plus termi
ti?er l3, left-hand winding of relay ii, contact of nal iitl through contact 89, winding of relay ii
relay ii, contact 35 of relay it, back to left-hand to minus terminal M and at the same time re‘
side of the secondary of the transformer 5 moves the line completely from the relay equip
through resistance 22. The contacts of relay iii ment through the left-hand contacts of relay 6
also cause the public signal lamp id to light and and ‘connects the operator’s cord circuit in its
place. The operation of relay i breaks the look
ing of the resistance 9 at the alarm box and
ing circuits of relays 9 and Id at the ?rst and , marginal relay ll operates breaking the circuit
secondary hand contacts of relay 9. At the same at its contact and releasing both relays 9 and
time the operation of relay 9 causes relays 9 and 19 which brings in the trouble condition as de- ,
ill to operate this circuit extending from the left- - scribed above. The trouble lamp remains lit
hand contact of-the secondary of transformer 5 until relay 6 has been operated and the relay
resistance 22, right outermost contact of relay 6, J apparatus returned to normal.
the two respective windings of marginal relay H,
recti?ers I3 and I2, windings of relays 9 and i9
10 respectively back to the right-hand contact of
the secondary of transformer 5.
may now take place between the operator at cen
tral station B and whoever may be using the
telephone set at the substation A.
After the conversation between the operator
and the person transmitting the alarm has been
completed, the operator removes the plug 20',
and if no further signals come in, knows that the
telephone has been replaced on the switchhook at
20 substation A and the door of the alarm box there
at has been properly closed. If the alarm box door
. had been left open, or the telephone set has not
been replaced, she would be noti?ed by the fact
that as soon as she removed the plug 20', one of
25 the signal lamps 16,29 or 25 would appear over
one of the other circuits previously traced in
connection with the operation of these lamps.
If the operator wishes to signal the patrolman
at the station A, she plugs into the Jack associ;
30 ated with the box at that station. This causes the
operation of relay 6 and removes all terminal
. equipment at thecentral station B from the line
as formerly described, and she can then ring
through to the station A by means of ringing cur
35 rent of a frequencyother than that used for the
normal line condition (in this case 60 cycles for
normal, 20 cycles for ringing), the condenser l9
being of such capacity as to easily pass 60 cycles
but not 20 cycles so that current must go through
40 relay 23 which, in series with its associated con
denser, is tuned for 20 cycles. The ringing cur
rent is supplied over her cord circuit in a well
understood manner. The ringing current oper
ates ringing relay 23 at station A and signal 24
is operated through the following circuit. Right
hand contact of power source 29, inner contact of
relay 23, signal 24, outer contact of relay 29, to
the right-hand contact of power source 29. In
response to-this signal the patrolman at the sub
50 station will open the door by means of a key and
remove the telephone set thereat establishing a
talking connection with the operator.
The supervisory features of this circuit oper
ate as follows: If the line goes open instantane
55 ously or for a long period of time relays 9 and
I0 both release as the circuit through their wind
ing is broken and trouble lamp 25 at the central
station B lights and the general trouble gong
26 at the central o?ice B operates. This circuit
extends from minus terminal 36 through the
extreme left-hand contact of relay l0, lamp 25,
extreme right-hand contact of relay 9, gong 26
back to positive terminal 31. If a ground appears
on either side of the line, both relays 9 and 10
65 release due to the fact that a current path is
set up between the ground on the line Land a
permanent ground on one side of the Source of
power 5, at the headquarters station and trouble
light 25 lights to show a troubled condition. This
70 also operates the general trouble gong‘ 26. The
lighting of lamp 25 and the operation of the
gong 26, is accomplished by means of the cir
cuit as. described in the case of an open line con
dition. If the line is short circuited an increase
75 in current immediately results due to the shunt~
In order to maintain relays 9 and I0 operated
on the interrupted direct current which ?ows
through their windingsthey are shunted by rec
ti?ers 21 and 28, respectively, which act as uni
directional shunts for these relays. These shunt
circuits provide means for holding the relays 9
and i0 operated if either of these relays tends to
be opened for a predetermined interval. It is also 15
shown and described in connection with Fig. 2.
The circuit for holding either or both of the
relays 9 and I0 operated while pulsating or rec
ti?ed current is ?owing therethrough may be bet
ter understood in connection with the arrange
ment shown in Fig. 2. Here an alternating cur
rent source 5' is connected to the winding of re
lay 9, the interconnecting circuit including a uni
directional device II or other interrupter. The
winding of relay 9 is shunted by another uni
directional device 21 which is poled in opposi
tion to the device l3 when viewed: from the
source 5'.
Upon the interruption of current from the
source 5' caused by the opposition of the recti 80
?er 13 the magnetic ?eld of relay 9 tends to col
lapse, therebytending to release the armature of
this relay. The release of’the armatureis made
impossible for a short interval in the circuit by
virtue of the presence of the shunt circuit in
cluding the recti?er 21,
As the magnetic ?eld of the relay 9 decreases
in amplitude a voltage is set up across the wind
ing- of relay 9 the magnitude of which depends
in part upon the resistance of the winding as
well as‘upon the number of turns therein and
the size of-the iron core. This voltage causes
a ?ow of current through the shunt circuit of the
recti?er 21, and this current is in such a direc
tion as to maintain the armature of the relay con
tinuously closed against its make contact.
Thus it will be' seen that as pulsating current
?ows through the winding of relay 9, the tend
ency of the armature to release is completely elim
inated by virtue‘of the presence of the rectifying
device 21. It will be understood that the use of
any other unidirectional device may be inserted
in place of the recti?er 21.
It will be apparent that the arrangement shown
in Fig, 2 may be employed in‘ preventing relays ‘
and translating devices in general from releasing
during brief intervals of time when current from
the primary source may be interrupted, and also
may be used to make such devices slow release
when current is completely out off.» This arrange—
ment provides a circulating path through which
is transmitted a current corresponding to the
voltage built up across the winding of the ‘relay
or across the translating device at the very time
when the current therethrough might be insu?i
cient to maintain these devices continuously op
What is claimed is:
1. In an alarm system, a central station, a sub
station connected thereto, ?rst and second keying 70
devices at said- substation, ?rst and second nor
mally operated relays at the central station cor
responding to said substation, means responsive
to the operation of the- ?rst keying device at the
substation for maintaining the corresponding ?rst
switch for transmitting pulsating current through
relay operated and for deenergizing the second re
lay', means responsive to the operation of the first one ‘of said relays, means responsive to the opera
and second keying devices at the substation for tion of the ?rst and second switches for trans
operating the corresponding second relay and mitting pulsating current through the’other of
for deenergizing the ?rst relay, and means for
operating both the ?rst and second relays cor
responding to the substation when both the first
and second keying devices are unoperated.
2. The combination of a main station, an aux
iliary station, ?rst and second switches at the
auxiliary‘station, two relays at the main station,
means responsive .to the operation of the ?rst
said relays, means for operating both relays by 5 '
pulsating current when both switches are'un
operated, and means including a unidirectional
device connected in shunt with the winding of
each relay for maintaining each relay continuous
1y operated while pulsating current ‘is supplied 10
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